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                  <a href="#gstreamer-GstDeviceMonitor.description" class="shortcut">Description</a></span>
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<a name="gstreamer-GstDeviceMonitor"></a><div class="titlepage"></div>
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<h2><span class="refentrytitle"><a name="gstreamer-GstDeviceMonitor.top_of_page"></a>GstDeviceMonitor</span></h2>
<p>GstDeviceMonitor — A device monitor and prober</p>
</td>
<td class="gallery_image" valign="top" align="right"></td>
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<div class="refsect1">
<a name="gstreamer-GstDeviceMonitor.functions"></a><h2>Functions</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="functions_return">
<col class="functions_name">
</colgroup>
<tbody>
<tr>
<td class="function_type">
<a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="returnvalue">GstDeviceMonitor</span></a> *
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstDeviceMonitor.html#gst-device-monitor-new" title="gst_device_monitor_new ()">gst_device_monitor_new</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a class="link" href="GstBus.html" title="GstBus"><span class="returnvalue">GstBus</span></a> *
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstDeviceMonitor.html#gst-device-monitor-get-bus" title="gst_device_monitor_get_bus ()">gst_device_monitor_get_bus</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstDeviceMonitor.html#gst-device-monitor-add-filter" title="gst_device_monitor_add_filter ()">gst_device_monitor_add_filter</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstDeviceMonitor.html#gst-device-monitor-remove-filter" title="gst_device_monitor_remove_filter ()">gst_device_monitor_remove_filter</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstDeviceMonitor.html#gst-device-monitor-start" title="gst_device_monitor_start ()">gst_device_monitor_start</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstDeviceMonitor.html#gst-device-monitor-stop" title="gst_device_monitor_stop ()">gst_device_monitor_stop</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> *
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstDeviceMonitor.html#gst-device-monitor-get-devices" title="gst_device_monitor_get_devices ()">gst_device_monitor_get_devices</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> **
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstDeviceMonitor.html#gst-device-monitor-get-providers" title="gst_device_monitor_get_providers ()">gst_device_monitor_get_providers</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstDeviceMonitor.html#gst-device-monitor-get-show-all-devices" title="gst_device_monitor_get_show_all_devices ()">gst_device_monitor_get_show_all_devices</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstDeviceMonitor.html#gst-device-monitor-set-show-all-devices" title="gst_device_monitor_set_show_all_devices ()">gst_device_monitor_set_show_all_devices</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> **
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstDeviceMonitor.html#gst-device-provider-get-hidden-providers" title="gst_device_provider_get_hidden_providers ()">gst_device_provider_get_hidden_providers</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstDeviceMonitor.html#gst-device-provider-hide-provider" title="gst_device_provider_hide_provider ()">gst_device_provider_hide_provider</a> <span class="c_punctuation">()</span>
</td>
</tr>
<tr>
<td class="function_type">
<span class="returnvalue">void</span>
</td>
<td class="function_name">
<a class="link" href="gstreamer-GstDeviceMonitor.html#gst-device-provider-unhide-provider" title="gst_device_provider_unhide_provider ()">gst_device_provider_unhide_provider</a> <span class="c_punctuation">()</span>
</td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gstreamer-GstDeviceMonitor.other"></a><h2>Types and Values</h2>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="name">
<col class="description">
</colgroup>
<tbody>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor">GstDeviceMonitor</a></td>
</tr>
<tr>
<td class="datatype_keyword">struct</td>
<td class="function_name"><a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitorClass" title="struct GstDeviceMonitorClass">GstDeviceMonitorClass</a></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect1">
<a name="gstreamer-GstDeviceMonitor.includes"></a><h2>Includes</h2>
<pre class="synopsis">#include &lt;gst/gst.h&gt;
</pre>
</div>
<div class="refsect1">
<a name="gstreamer-GstDeviceMonitor.description"></a><h2>Description</h2>
<p>Applications should create a <a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a> when they want
to probe, list and monitor devices of a specific type. The
<a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a> will create the appropriate
<a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> objects and manage them. It will then post
messages on its <a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a> for devices that have been added and
removed.</p>
<p>The device monitor will monitor all devices matching the filters that
the application has set.</p>
<p>The basic use pattern of a device monitor is as follows:</p>
<div class="informalexample">
  <table class="listing_frame" border="0" cellpadding="0" cellspacing="0">
    <tbody>
      <tr>
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48</pre></td>
        <td class="listing_code"><pre class="programlisting"><span class="gtkdoc kwb">static</span> gboolean
<span class="function">my_bus_func</span> <span class="gtkdoc opt">(</span>GstBus <span class="gtkdoc opt">*</span> bus<span class="gtkdoc opt">,</span> GstMessage <span class="gtkdoc opt">*</span> message<span class="gtkdoc opt">,</span> gpointer user_data<span class="gtkdoc opt">)</span>
<span class="gtkdoc opt">{</span>
   GstDevice <span class="gtkdoc opt">*</span>device<span class="gtkdoc opt">;</span>
   gchar <span class="gtkdoc opt">*</span>name<span class="gtkdoc opt">;</span>

   <span class="keyword">switch</span> <span class="gtkdoc opt">(</span><span class="function"><a href="GstMessage.html#GST-MESSAGE-TYPE:CAPS">GST_MESSAGE_TYPE</a></span> <span class="gtkdoc opt">(</span>message<span class="gtkdoc opt">)) {</span>
     <span class="keyword">case</span> GST_MESSAGE_DEVICE_ADDED<span class="gtkdoc opt">:</span>
       <span class="function"><a href="GstMessage.html#gst-message-parse-device-added">gst_message_parse_device_added</a></span> <span class="gtkdoc opt">(</span>message<span class="gtkdoc opt">, &amp;</span>device<span class="gtkdoc opt">);</span>
       name <span class="gtkdoc opt">=</span> <span class="function"><a href="gstreamer-GstDevice.html#gst-device-get-display-name">gst_device_get_display_name</a></span> <span class="gtkdoc opt">(</span>device<span class="gtkdoc opt">);</span>
       <span class="function"><a href="/usr/share/gtk-doc/html/glib/glib-Warnings-and-Assertions.html#g-print">g_print</a></span><span class="gtkdoc opt">(</span><span class="string">&quot;Device added: %s</span><span class="gtkdoc esc">\n</span><span class="string">&quot;</span><span class="gtkdoc opt">,</span> name<span class="gtkdoc opt">);</span>
       <span class="function"><a href="/usr/share/gtk-doc/html/glib/glib-Memory-Allocation.html#g-free">g_free</a></span> <span class="gtkdoc opt">(</span>name<span class="gtkdoc opt">);</span>
       <span class="function"><a href="GstObject.html#gst-object-unref">gst_object_unref</a></span> <span class="gtkdoc opt">(</span>device<span class="gtkdoc opt">);</span>
       <span class="keyword">break</span><span class="gtkdoc opt">;</span>
     <span class="keyword">case</span> GST_MESSAGE_DEVICE_REMOVED<span class="gtkdoc opt">:</span>
       <span class="function"><a href="GstMessage.html#gst-message-parse-device-removed">gst_message_parse_device_removed</a></span> <span class="gtkdoc opt">(</span>message<span class="gtkdoc opt">, &amp;</span>device<span class="gtkdoc opt">);</span>
       name <span class="gtkdoc opt">=</span> <span class="function"><a href="gstreamer-GstDevice.html#gst-device-get-display-name">gst_device_get_display_name</a></span> <span class="gtkdoc opt">(</span>device<span class="gtkdoc opt">);</span>
       <span class="function"><a href="/usr/share/gtk-doc/html/glib/glib-Warnings-and-Assertions.html#g-print">g_print</a></span><span class="gtkdoc opt">(</span><span class="string">&quot;Device removed: %s</span><span class="gtkdoc esc">\n</span><span class="string">&quot;</span><span class="gtkdoc opt">,</span> name<span class="gtkdoc opt">);</span>
       <span class="function"><a href="/usr/share/gtk-doc/html/glib/glib-Memory-Allocation.html#g-free">g_free</a></span> <span class="gtkdoc opt">(</span>name<span class="gtkdoc opt">);</span>
       <span class="function"><a href="GstObject.html#gst-object-unref">gst_object_unref</a></span> <span class="gtkdoc opt">(</span>device<span class="gtkdoc opt">);</span>
       <span class="keyword">break</span><span class="gtkdoc opt">;</span>
     <span class="keyword">default</span><span class="gtkdoc opt">:</span>
       <span class="keyword">break</span><span class="gtkdoc opt">;</span>
   <span class="gtkdoc opt">}</span>

   <span class="keyword">return</span> G_SOURCE_CONTINUE<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</span>

GstDeviceMonitor <span class="gtkdoc opt">*</span>
<span class="function">setup_raw_video_source_device_monitor</span> <span class="gtkdoc opt">(</span><span class="gtkdoc kwb">void</span><span class="gtkdoc opt">) {</span>
   GstDeviceMonitor <span class="gtkdoc opt">*</span>monitor<span class="gtkdoc opt">;</span>
   GstBus <span class="gtkdoc opt">*</span>bus<span class="gtkdoc opt">;</span>
   GstCaps <span class="gtkdoc opt">*</span>caps<span class="gtkdoc opt">;</span>

   monitor <span class="gtkdoc opt">=</span> <span class="function"><a href="gstreamer-GstDeviceMonitor.html#gst-device-monitor-new">gst_device_monitor_new</a></span> <span class="gtkdoc opt">();</span>

   bus <span class="gtkdoc opt">=</span> <span class="function"><a href="gstreamer-GstDeviceMonitor.html#gst-device-monitor-get-bus">gst_device_monitor_get_bus</a></span> <span class="gtkdoc opt">(</span>monitor<span class="gtkdoc opt">);</span>
   <span class="function"><a href="GstBus.html#gst-bus-add-watch">gst_bus_add_watch</a></span> <span class="gtkdoc opt">(</span>bus<span class="gtkdoc opt">,</span> my_bus_func<span class="gtkdoc opt">,</span> NULL<span class="gtkdoc opt">);</span>
   <span class="function"><a href="GstObject.html#gst-object-unref">gst_object_unref</a></span> <span class="gtkdoc opt">(</span>bus<span class="gtkdoc opt">);</span>

   caps <span class="gtkdoc opt">=</span> <span class="function"><a href="GstCaps.html#gst-caps-new-empty-simple">gst_caps_new_empty_simple</a></span> <span class="gtkdoc opt">(</span><span class="string">&quot;video/x-raw&quot;</span><span class="gtkdoc opt">);</span>
   <span class="function"><a href="gstreamer-GstDeviceMonitor.html#gst-device-monitor-add-filter">gst_device_monitor_add_filter</a></span> <span class="gtkdoc opt">(</span>monitor<span class="gtkdoc opt">,</span> <span class="string">&quot;Video/Source&quot;</span><span class="gtkdoc opt">,</span> caps<span class="gtkdoc opt">);</span>
   <span class="function"><a href="GstCaps.html#gst-caps-unref">gst_caps_unref</a></span> <span class="gtkdoc opt">(</span>caps<span class="gtkdoc opt">);</span>

   <span class="function"><a href="gstreamer-GstDeviceMonitor.html#gst-device-monitor-start">gst_device_monitor_start</a></span> <span class="gtkdoc opt">(</span>monitor<span class="gtkdoc opt">);</span>

   <span class="keyword">return</span> monitor<span class="gtkdoc opt">;</span>
<span class="gtkdoc opt">}</span></pre></td>
      </tr>
    </tbody>
  </table>
</div>

<p></p>
</div>
<div class="refsect1">
<a name="gstreamer-GstDeviceMonitor.functions_details"></a><h2>Functions</h2>
<div class="refsect2">
<a name="gst-device-monitor-new"></a><h3>gst_device_monitor_new ()</h3>
<pre class="programlisting"><a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="returnvalue">GstDeviceMonitor</span></a> *
gst_device_monitor_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>Create a new <a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a></p>
<div class="refsect3">
<a name="gst-device-monitor-new.returns"></a><h4>Returns</h4>
<p>a new device monitor. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix08.html#api-index-1.4">1.4</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-device-monitor-get-bus"></a><h3>gst_device_monitor_get_bus ()</h3>
<pre class="programlisting"><a class="link" href="GstBus.html" title="GstBus"><span class="returnvalue">GstBus</span></a> *
gst_device_monitor_get_bus (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a> *monitor</code></em>);</pre>
<p>Gets the <a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a> of this <a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a></p>
<div class="refsect3">
<a name="gst-device-monitor-get-bus.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>monitor</p></td>
<td class="parameter_description"><p>a <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-device-monitor-get-bus.returns"></a><h4>Returns</h4>
<p>a <a class="link" href="GstBus.html" title="GstBus"><span class="type">GstBus</span></a>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix08.html#api-index-1.4">1.4</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-device-monitor-add-filter"></a><h3>gst_device_monitor_add_filter ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="returnvalue">guint</span></a>
gst_device_monitor_add_filter (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a> *monitor</code></em>,
                               <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *classes</code></em>,
                               <em class="parameter"><code><a class="link" href="GstCaps.html" title="GstCaps"><span class="type">GstCaps</span></a> *caps</code></em>);</pre>
<p>Adds a filter for which <a class="link" href="gstreamer-GstDevice.html#GstDevice" title="struct GstDevice"><span class="type">GstDevice</span></a> will be monitored, any device that matches
all these classes and the <a class="link" href="GstCaps.html" title="GstCaps"><span class="type">GstCaps</span></a> will be returned.</p>
<p>If this function is called multiple times to add more filters, each will be
matched independently. That is, adding more filters will not further restrict
what devices are matched.</p>
<p>The <a class="link" href="GstCaps.html" title="GstCaps"><span class="type">GstCaps</span></a> supported by the device as returned by <a class="link" href="gstreamer-GstDevice.html#gst-device-get-caps" title="gst_device_get_caps ()"><code class="function">gst_device_get_caps()</code></a> are
not intersected with caps filters added using this function.</p>
<p>Filters must be added before the <a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a> is started.</p>
<div class="refsect3">
<a name="gst-device-monitor-add-filter.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>monitor</p></td>
<td class="parameter_description"><p>a device monitor</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>classes</p></td>
<td class="parameter_description"><p>device classes to use as filter or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> for any class. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
<tr>
<td class="parameter_name"><p>caps</p></td>
<td class="parameter_description"><p>the <a class="link" href="GstCaps.html" title="GstCaps"><span class="type">GstCaps</span></a> to filter or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> for ANY. </p></td>
<td class="parameter_annotations"><span class="annotation">[<acronym title="NULL is OK, both for passing and for returning."><span class="acronym">allow-none</span></acronym>]</span></td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-device-monitor-add-filter.returns"></a><h4>Returns</h4>
<p> The id of the new filter or 0 if no provider matched the filter's
classes.</p>
</div>
<p class="since">Since: <a class="link" href="ix08.html#api-index-1.4">1.4</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-device-monitor-remove-filter"></a><h3>gst_device_monitor_remove_filter ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_device_monitor_remove_filter (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a> *monitor</code></em>,
                                  <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#guint"><span class="type">guint</span></a> filter_id</code></em>);</pre>
<p>Removes a filter from the <a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a> using the id that was returned
by <a class="link" href="gstreamer-GstDeviceMonitor.html#gst-device-monitor-add-filter" title="gst_device_monitor_add_filter ()"><code class="function">gst_device_monitor_add_filter()</code></a>.</p>
<div class="refsect3">
<a name="gst-device-monitor-remove-filter.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>monitor</p></td>
<td class="parameter_description"><p>a device monitor</p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>filter_id</p></td>
<td class="parameter_description"><p>the id of the filter</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-device-monitor-remove-filter.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> of the filter id was valid, <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#FALSE:CAPS"><code class="literal">FALSE</code></a> otherwise</p>
</div>
<p class="since">Since: <a class="link" href="ix08.html#api-index-1.4">1.4</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-device-monitor-start"></a><h3>gst_device_monitor_start ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_device_monitor_start (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a> *monitor</code></em>);</pre>
<p>Starts monitoring the devices, one this has succeeded, the
<a class="link" href="GstMessage.html#GST-MESSAGE-DEVICE-ADDED:CAPS"><code class="literal">GST_MESSAGE_DEVICE_ADDED</code></a> and <a class="link" href="GstMessage.html#GST-MESSAGE-DEVICE-REMOVED:CAPS"><code class="literal">GST_MESSAGE_DEVICE_REMOVED</code></a> messages
will be emitted on the bus when the list of devices changes.</p>
<div class="refsect3">
<a name="gst-device-monitor-start.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>monitor</p></td>
<td class="parameter_description"><p>A <a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-device-monitor-start.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> if the device monitoring could be started</p>
</div>
<p class="since">Since: <a class="link" href="ix08.html#api-index-1.4">1.4</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-device-monitor-stop"></a><h3>gst_device_monitor_stop ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_device_monitor_stop (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a> *monitor</code></em>);</pre>
<p>Stops monitoring the devices.</p>
<div class="refsect3">
<a name="gst-device-monitor-stop.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>monitor</p></td>
<td class="parameter_description"><p>A <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix08.html#api-index-1.4">1.4</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-device-monitor-get-devices"></a><h3>gst_device_monitor_get_devices ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Doubly-Linked-Lists.html#GList"><span class="returnvalue">GList</span></a> *
gst_device_monitor_get_devices (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a> *monitor</code></em>);</pre>
<p>Gets a list of devices from all of the relevant monitors. This may actually
probe the hardware if the monitor is not currently started.</p>
<div class="refsect3">
<a name="gst-device-monitor-get-devices.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>monitor</p></td>
<td class="parameter_description"><p>A <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-device-monitor-get-devices.returns"></a><h4>Returns</h4>
<p>a <a href="/usr/share/gtk-doc/html/glib/glib-Doubly-Linked-Lists.html#GList"><span class="type">GList</span></a> of
<a class="link" href="gstreamer-GstDevice.html#GstDevice" title="struct GstDevice"><span class="type">GstDevice</span></a>. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> GstDevice][<acronym title="NULL may be passed as the value in, out, in-out; or as a return value."><span class="acronym">nullable</span></acronym>]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix08.html#api-index-1.4">1.4</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-device-monitor-get-providers"></a><h3>gst_device_monitor_get_providers ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> **
gst_device_monitor_get_providers (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a> *monitor</code></em>);</pre>
<p>Get a list of the currently selected device provider factories.</p>
<p>This</p>
<div class="refsect3">
<a name="gst-device-monitor-get-providers.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>monitor</p></td>
<td class="parameter_description"><p>a <a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-device-monitor-get-providers.returns"></a><h4>Returns</h4>
<p>A list of device provider factory names that are currently being
monitored by <em class="parameter"><code>monitor</code></em>
or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> when nothing is being monitored. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> gchar*]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.6">1.6</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-device-monitor-get-show-all-devices"></a><h3>gst_device_monitor_get_show_all_devices ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="returnvalue">gboolean</span></a>
gst_device_monitor_get_show_all_devices
                               (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a> *monitor</code></em>);</pre>
<p>Get if <em class="parameter"><code>monitor</code></em>
 is curretly showing all devices, even those from hidden
providers.</p>
<div class="refsect3">
<a name="gst-device-monitor-get-show-all-devices.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>monitor</p></td>
<td class="parameter_description"><p>a <a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-device-monitor-get-show-all-devices.returns"></a><h4>Returns</h4>
<p> <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#TRUE:CAPS"><code class="literal">TRUE</code></a> when all devices will be shown.</p>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.6">1.6</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-device-monitor-set-show-all-devices"></a><h3>gst_device_monitor_set_show_all_devices ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_device_monitor_set_show_all_devices
                               (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a> *monitor</code></em>,
                                <em class="parameter"><code><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gboolean"><span class="type">gboolean</span></a> show_all</code></em>);</pre>
<p>Set if all devices should be visible, even those devices from hidden
providers. Setting <em class="parameter"><code>show_all</code></em>
 to true might show some devices multiple times.</p>
<div class="refsect3">
<a name="gst-device-monitor-set-show-all-devices.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>monitor</p></td>
<td class="parameter_description"><p>a <a class="link" href="gstreamer-GstDeviceMonitor.html#GstDeviceMonitor" title="struct GstDeviceMonitor"><span class="type">GstDeviceMonitor</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>show_all</p></td>
<td class="parameter_description"><p>show all devices</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.6">1.6</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-device-provider-get-hidden-providers"></a><h3>gst_device_provider_get_hidden_providers ()</h3>
<pre class="programlisting"><a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="returnvalue">gchar</span></a> **
gst_device_provider_get_hidden_providers
                               (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> *provider</code></em>);</pre>
<p>Get the provider factory names of the <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> instances that
are hidden by <em class="parameter"><code>provider</code></em>
.</p>
<div class="refsect3">
<a name="gst-device-provider-get-hidden-providers.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody><tr>
<td class="parameter_name"><p>provider</p></td>
<td class="parameter_description"><p>a <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<div class="refsect3">
<a name="gst-device-provider-get-hidden-providers.returns"></a><h4>Returns</h4>
<p>a list of hidden providers factory names or <a href="/usr/share/gtk-doc/html/glib/glib-Standard-Macros.html#NULL:CAPS"><code class="literal">NULL</code></a> when
nothing is hidden by <em class="parameter"><code>provider</code></em>
. Free with g_strfreev. </p>
<p><span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>][<acronym title="Parameter points to an array of items."><span class="acronym">array</span></acronym> zero-terminated=1][<acronym title="Generics and defining elements of containers and arrays."><span class="acronym">element-type</span></acronym> gchar*]</span></p>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.6">1.6</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-device-provider-hide-provider"></a><h3>gst_device_provider_hide_provider ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_device_provider_hide_provider (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> *provider</code></em>,
                                   <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);</pre>
<p>Make <em class="parameter"><code>provider</code></em>
 hide the devices from the factory with <em class="parameter"><code>name</code></em>
.</p>
<p>This function is used when <em class="parameter"><code>provider</code></em>
 will also provide the devices reported
by provider factory <em class="parameter"><code>name</code></em>
. A monitor should stop monitoring the
device provider with <em class="parameter"><code>name</code></em>
 to avoid duplicate devices.</p>
<div class="refsect3">
<a name="gst-device-provider-hide-provider.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>provider</p></td>
<td class="parameter_description"><p>a <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>name</p></td>
<td class="parameter_description"><p>a provider factory name</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.6">1.6</a></p>
</div>
<hr>
<div class="refsect2">
<a name="gst-device-provider-unhide-provider"></a><h3>gst_device_provider_unhide_provider ()</h3>
<pre class="programlisting"><span class="returnvalue">void</span>
gst_device_provider_unhide_provider (<em class="parameter"><code><a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a> *provider</code></em>,
                                     <em class="parameter"><code>const <a href="/usr/share/gtk-doc/html/glib/glib-Basic-Types.html#gchar"><span class="type">gchar</span></a> *name</code></em>);</pre>
<p>Make <em class="parameter"><code>provider</code></em>
 unhide the devices from factory <em class="parameter"><code>name</code></em>
.</p>
<p>This function is used when <em class="parameter"><code>provider</code></em>
 will no longer provide the devices
reported by provider factory <em class="parameter"><code>name</code></em>
. A monitor should start
monitoring the devices from provider factory <em class="parameter"><code>name</code></em>
 in order to see
all devices again.</p>
<div class="refsect3">
<a name="gst-device-provider-unhide-provider.parameters"></a><h4>Parameters</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="150px" class="parameters_name">
<col class="parameters_description">
<col width="200px" class="parameters_annotations">
</colgroup>
<tbody>
<tr>
<td class="parameter_name"><p>provider</p></td>
<td class="parameter_description"><p>a <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a></p></td>
<td class="parameter_annotations"> </td>
</tr>
<tr>
<td class="parameter_name"><p>name</p></td>
<td class="parameter_description"><p>a provider factory name</p></td>
<td class="parameter_annotations"> </td>
</tr>
</tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix07.html#api-index-1.6">1.6</a></p>
</div>
</div>
<div class="refsect1">
<a name="gstreamer-GstDeviceMonitor.other_details"></a><h2>Types and Values</h2>
<div class="refsect2">
<a name="GstDeviceMonitor"></a><h3>struct GstDeviceMonitor</h3>
<pre class="programlisting">struct GstDeviceMonitor {
  GstObject                parent;
};
</pre>
<p>Opaque device monitor object structure.</p>
<div class="refsect3">
<a name="GstDeviceMonitor.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody><tr>
<td class="struct_member_name"><p><a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> <em class="structfield"><code><a name="GstDeviceMonitor.parent"></a>parent</code></em>;</p></td>
<td class="struct_member_description"><p>the parent <a class="link" href="GstObject.html" title="GstObject"><span class="type">GstObject</span></a> structure</p></td>
<td class="struct_member_annotations"> </td>
</tr></tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix08.html#api-index-1.4">1.4</a></p>
</div>
<hr>
<div class="refsect2">
<a name="GstDeviceMonitorClass"></a><h3>struct GstDeviceMonitorClass</h3>
<pre class="programlisting">struct GstDeviceMonitorClass {
  GstObjectClass           parent_class;
};
</pre>
<p>Opaque device monitor class structure.</p>
<div class="refsect3">
<a name="GstDeviceMonitorClass.members"></a><h4>Members</h4>
<div class="informaltable"><table class="informaltable" width="100%" border="0">
<colgroup>
<col width="300px" class="struct_members_name">
<col class="struct_members_description">
<col width="200px" class="struct_members_annotations">
</colgroup>
<tbody></tbody>
</table></div>
</div>
<p class="since">Since: <a class="link" href="ix08.html#api-index-1.4">1.4</a></p>
</div>
</div>
<div class="refsect1">
<a name="gstreamer-GstDeviceMonitor.see-also"></a><h2>See Also</h2>
<p><a class="link" href="gstreamer-GstDevice.html#GstDevice" title="struct GstDevice"><span class="type">GstDevice</span></a>, <a class="link" href="gstreamer-GstDeviceProvider.html#GstDeviceProvider" title="struct GstDeviceProvider"><span class="type">GstDeviceProvider</span></a></p>
</div>
</div>
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